Preparation of nanometer oxides La1−xSrxMnO3 by absolute alcohol as solvent

Nanometer oxides La1-xSrxMnO3 were synthesized by absolute alcohol as solvent. The desired metal cations were chelated in a solution using citric acid as the chelating agents. In order to get the optimum preparation condition for Lal-xSrxMnO3, the pH of primal commix solution, the molar fraction of citric acid and baking temperature of predecessor block were researched by orthogonal test design method with different x. The thermal decomposition of the metal carboxylate precursor gels was studied by TG/DTA and the products derived from calcinations of the gels were characterized by XRD and TEM. The polarization curves were acquired on an electrochemical work station （LK98） and the discharge curves were acquired on a testing instrument of batteries （DC-5） with a constant current discharge under 120 mA/cm^2. The results reveal that the nanometer oxides can be achieved by absolute alcohol as solvent and it has better catalytic activity.     

1549mm热连轧传动系统

介绍了由我国自行研制和设计的太钢1549mm热连轧机的电气传动系统,该系统采用了全数字直流传动和高压大功率晶闸管变流装置等多项新技术。采用该系统比引进国外同类型设备节约了8330万元。     

传统犀皮漆工艺在首饰设计中的应用研究

中国珠宝首饰历史悠久，种类繁多，据出土文物可考，战国时期就出现了大漆首饰，犀皮漆作为中国传统漆艺的重要组成部分，源远流长，魅力独特，是中国传统漆艺的重要组成部分，具有深厚的历史价值和独特的审美韵味。通过对传统犀皮漆工艺技法和审美特点的深入探讨，将犀皮漆工艺融入现代珠宝首饰设计中，尝试犀皮漆与银饰的搭配，可以突破目前市场上传统漆器首饰单一的形式，既为漆工艺融入现代生活提供了新的思路，也为珠宝首饰设计与非物质文化遗产融合发展提供了新的发展方向，是提升珠宝设计文化内涵的有效途径。